powerpoint.java

来自「简单的幻灯片小程序,可以手动地调换幻灯片.」· Java 代码 · 共 45 行

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class powerpoint extends Applet implements ActionListener
{	int id=1;
    Button b1=new Button("next");
	Button b2=new Button("forward");
	Panel p1=new Panel();
    Image image[]=new Image[4];


	public void init()
	{   setLayout(new BorderLayout());
		add(p1,BorderLayout.SOUTH);
		p1.add(b1);
		p1.add(b2);
        b1.addActionListener(this);
		b2.addActionListener(this);
		Toolkit kit = Toolkit.getDefaultToolkit();
		for (int i=1;i<=3;i++)
		  {image[i]= kit.getImage("pic"+i+".jpg");}
               
	}

      public void paint(Graphics g){
           
           if (id==4)
              id=1;
           if (id==0)
              id=3;   
           g.drawImage(image[id],0,0,this);
	
       }	

      public void actionPerformed(ActionEvent e)
	{       if (e.getSource()==b1)
		      id++;
			else
              id--;
		    repaint();
         }
  
 
}